content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2012, by Object Refinery Limited and Contributors.
   *
   * Project Info:  http://www.jfree.org/jfreechart/index.html
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation; either version 2.1 of the License, or
   * (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   *
   * [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
   * Other names may be trademarks of their respective owners.]
   *
   * ---------------
   * EmptyBlock.java
   * ---------------
   * (C) Copyright 2004-2012, by Object Refinery Limited.
   *
   * Original Author:  David Gilbert (for Object Refinery Limited);
   * Contributor(s):   -;
   *
   * Changes:
   * --------
   * 22-Oct-2004 : Version 1 (DG);
   * 04-Feb-2005 : Now cloneable and serializable (DG);
   * 20-Apr-2005 : Added new draw() method (DG);
   * 08-Apr-2008 : Added support for margin and border (DG);
   * 08-May-2008 : Updated arrange() method to recognise incoming constraint (DG);
   * 17-Jun-2012 : Removed JCommon dependencies (DG);
   *
   */
  
  package org.jfree.chart.block;
  
  import java.awt.Graphics2D;
  import java.awt.geom.Rectangle2D;
  import java.io.Serializable;
  
  import org.jfree.chart.ui.Size2D;
  import org.jfree.chart.util.PublicCloneable;
  
  /**
   * An empty block with a fixed size.
   */
  public class EmptyBlock extends AbstractBlock
          implements Block, Cloneable, PublicCloneable, Serializable {
  
      /** For serialization. */
      private static final long serialVersionUID = -4083197869412648579L;
  
      /**
       * Creates a new block with the specified width and height.
       *
       * @param width  the width.
       * @param height  the height.
       */
      public EmptyBlock(double width, double height) {
          setWidth(width);
          setHeight(height);
      }
  
      /**
       * Arranges the contents of the block, within the given constraints, and
       * returns the block size.
       *
       * @param g2  the graphics device.
       * @param constraint  the constraint (<code>null</code> not permitted).
       *
       * @return The block size (in Java2D units, never <code>null</code>).
       */
      @Override
      public Size2D arrange(Graphics2D g2, RectangleConstraint constraint) {
          Size2D base = new Size2D(calculateTotalWidth(getWidth()),
                  calculateTotalHeight(getHeight()));
          return constraint.calculateConstrainedSize(base);
      }
  
      /**
       * Draws the block.  Since the block is empty, there is nothing to draw
       * except the optional border.
       *
       * @param g2  the graphics device.
       * @param area  the area.
       */
      @Override
      public void draw(Graphics2D g2, Rectangle2D area) {
          draw(g2, area, null);
      }
  
      /**
       * Draws the block within the specified area.  Since the block is empty,
       * there is nothing to draw except the optional border.
       *
       * @param g2  the graphics device.
       * @param area  the area.
       * @param params  ignored (<code>null</code> permitted).
       *
       * @return Always <code>null</code>.
       */
      @Override
      public Object draw(Graphics2D g2, Rectangle2D area, Object params) {
          area = trimMargin(area);
          drawBorder(g2, area);
          return null;
      }
  
      /**
       * Returns a clone of the block.
       *
       * @return A clone.
       *
       * @throws CloneNotSupportedException if there is a problem cloning.
       */
      @Override
      public Object clone() throws CloneNotSupportedException {
          return super.clone();
      }
  
  }
  